Rubber adherent article



E. C. DOMM RUBBER ADHERENT ARTICLE Filed July 19, 1935 rubber coccizigarsenic or arzf'ma zy im, cadmium, Zara I 07 ZeaaZ 3% 7 7 0 as 1) casedill attains acumen annrnen'r an'ricm lEigin @arleton .lllvomm, Niles,Mich, assignor to National-Standard ilompany, Niles, li/lich, acorporation of .Wllichigan Application .llnly 19, I935, sen-all No.32.2w

I3 oral-1m (or. till-68.2)

This invention relates to a rubber-adherent article and, moreparticularly, to a method of increasing the adherence to rubberorcorrosionresistant ferrous base articles.

This application is a continuation, in part, of my co-pendingapplications, Ser. No. 665,425, filed April 10, 1933, and Serial No.737,666, filed July i934, and Serial No. 749,304, filed October 20,

As set forth in the latter application, I have discovered that theadhesiveness to rubber of zinc may be increased by coating the zinc witha thin layer of copper, and then alloying thecopper with the zinc in thecold, or under the mild heat of vulcanization, to produce a'thin layerof brass.

its was also set forth in that application, the adherence of cadmium,tin and lead to rubber may be increased in the same manner.

It has now been discovered that the adherence of zinc, cadmium, tin andlead may be increased with respect to rubber by plating thereon a thinlayer of a metal of the class consisting of antimony and arsenic.

While neither arsenic norantirnony has great adherence to rubber, thethin layer apparently alloys throughout, or at least is chemicallyaffected by the zinc in such manner that the resultant product hasgreater adherencethan either zinc or antimony alone. 1

In carrying out the invention, the base which has been coated with zinc,cadmium, lead or tin is plated with arsenic or antimony either byelectro deposition or by electroplating. In the case of steel tire beadreinforcing wires, the base coat is preferably of galvanized zinc andthe arsenic or antimony is applied thereto.

In the case of arsenic, the coating is preferably I16 to .021 gram perkilogram, having a diameter ill til

of .037 inch. The preferred range is .066 to .lli gram per kilogram.

In the case of antimony, the preferred coating is from bite .35 gram perkilogram.

The coatings are in the order of .000001 to .llildilod inch inthickness.

In plating the arsenic or antimony, a bath such as those disclosed in myco-pending applications Ser. No. 720,891, Serial No. 706,737 and SerialNo. 706,736 may be used, and the metals plated by electrodeposition fromsuch a bath. On the other hand, they may be plated by electroplating ofthe ordinary form. Following the plating, it is preferred'to dip thearticles in hot water and dry them so that they may be rapidly dried.

Such a bath, in the case of antimony, consists of 3 ounces of sodiumcyanide in one gallon of warm water in which A, ounce of antimonytrisulfide is dissolved, and which is then heated to 120 F. The solutionis preferably maintained at about this temperature during the reaction.

In the case of arsenic, solutions may be pre- 5 pared from therespective trisulfides in substantially the same molecular proportionsshown for the antimony trisulflde.

After plating, the articles are covered with a coating of rubber whichisvulcanized throughout.

v The invention is illustrated diagrammatically in the drawing. It isunderstood that the thicknesses shown. in the drawing are. not properlyillustrative of the true relative thicknesses, but 5 are shown purelyfor the purpose of illustration.

The term electrodeposition as used in the claims, coverselectrodeposition either by the use of an electric current or simply thesubstitution of one metal by another.

The foregoing detailed description has been given for clearness ofunderstanding only, and no unnecessary limitations should be understoodtherefrom, but the appended claims should be construed as broadly aspermissible, in view oi. the prior art.

What I claim as new, and desire to secure by Letters Patent, is:

l. The method of attaching an article coated with metal of the classconsisting of zinc, cadmiurn, tin and lead to rubber, which comprisesapplying to such coating a thin layer of metal of the class consistingof arsenic and antimony,

the layer being thin enough to alloy throughout with the underlyingmetal and produce a thin layer of alloy thereon, whereby theadhesiveness to rubber is increased, and vulcanizing a layer'of rubberthereto.

2. The method of attaching a ferrous base metal object having a coatingof a metal of the class consisting of zinc, cadmium, tin and leadthereon to rubber, which comprises applying to such coating a thin layerof metal of the class consisting of arsenic and antimony, the layer be-5 15 3 thin layer of a metal of the class consisting of metal of theclass consisting of arsenic and antimonythereon, the overlying metallayer being of a thinness to alloy throughout with the underlying metaland produce a thin .layer of. alloy thereon, and a rubber coatingvulcanized thereto.

6. A steel tire bead reinforcing wire having thereon a galvanized 'zinccoating, and having a arsenic and antimony thereon, said layer being ofa thinness to alloy throughout .with the zinc,

and produce a thin layer of alloy thereon, and a coating of rubbervulcanized thereto.

7. The method as set forth in claim 1, in which the arsenic or antimonyis applied by electrodeposition.

8. An articleas set forth in claim 4, in which the arsenic or antimonylayer is an electrodeposited layer.

9. The method as set forth in claim 1, in which the first coating is ofzinc.

10. The method as set forth in claim 1, in which the coating of arsenicand antimony are of the order of .000001 to ,000004 inch in thickness.

11. Anarticle as set forth in claim 4, in which the thickness of thearsenic or antimony is of the order of .000001 to .000004 inch.

12. An article as set forth in claim 4, in which the outer metal coatingis of arsenic.

13. An article as set forth in claim, 4, in which the outer metalcoatingis of antimony.

'ELGIN CARLE'ION DOMM.

